Variadic templates are arguably the most profound change in the core language brought about by C++11. Curiously, however, the C++ community still tiptoes carefully around them: variadic templates enjoyed less coverage than features such as "auto" or lambdas. Part of the reason is that more popular features simplify expression of existing designs, which makes said features easier to understand and use.
Variadic templates, however, not only simplify design and use of advanced libraries such as Boost MPL, but also enable a host of new uses.
This talk provides a solid coverage of variadic fundamentals, including typelists, the archetypal "safe printf" mechanics, and tuple construction and access. It also discusses more advanced uses, such as structured argument lists.